Carhartt Washed Duck Active Jac in the colour Carhartt Brown. Carhartt 104050 is an updated version of the classic J130 Active Jac, one of Carhartt's most popular insulated jackets. The shell is made from Carhartt's well-known heavyweight washed duck at 12 oz (407 g/m²) in 100% ring-spun cotton, and the jacket is insulated with 80g 3M Thinsulate – a lightweight, high-performance insulation that provides warmth without added bulk. The jacket is rated Warmth Level 3 (warmest) and is well suited to extremely cold conditions.

The interior is lined with quilted nylon, making the jacket easy to put on and take off. It features a full-length front zip, an attached hood with drawcord and cord lock, and internal rib-knit storm cuffs that keep out the cold. Articulated elbows allow freedom of movement, and Cordura-reinforced cuff edges withstand extra wear.

Two lined front pockets (one with a pen loop) and two internal pockets provide ample storage. Triple-stitched main seams ensure the jacket holds up to heavy use year after year.